The Polestar H630T3 is a 2,998 cc, inline‑six twin‑turbocharged petrol engine, integrated into a plug-in hybrid system, produced from 2024 for Polestar's flagship performance models. It features twin mono-scroll turbochargers, direct fuel injection, and is paired with an electric motor to form a high-output hybrid powertrain. In its standard hybrid configuration, it delivers a combined 490 kW (665 PS) and 900 Nm of torque, offering exceptional acceleration and a refined, powerful driving experience.
Exclusively fitted to the Polestar 4 fastback SUV, the H630T3 engine was engineered to deliver grand touring performance with near-silent electric operation in urban environments. Emissions compliance for the petrol component is achieved through a sophisticated engine management system and a gasoline particulate filter (GPF), meeting stringent Euro 6d standards. The hybrid system allows for significant zero-emission range, further reducing its overall environmental impact.
One documented area of focus for technicians is the calibration and diagnostics of the hybrid powertrain control unit, which manages the complex interaction between the combustion engine and electric motor. Polestar Service Information Bulletin PST‑HYB‑01 outlines specific diagnostic procedures and software update protocols to ensure optimal performance and drivetrain harmony.
All production years (2024–Present) meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/9876).
The Polestar H630T3 is a 2,998 cc inline‑six twin‑turbocharged petrol engine, forming the core of a plug-in hybrid system for flagship SUVs (2024-Present). It combines twin mono-scroll turbochargers with direct injection and electric assist to deliver effortless, high-speed cruising and blistering acceleration. Designed to meet Euro 6d standards, it offers a sophisticated blend of luxury performance and regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,998 cc | |
| Fuel type | Petrol (98 RON recommended) | |
| Configuration | Inline‑6, DOHC, 24‑valve | |
| Aspiration | Twin-turbocharged (sequential) | |
| Bore × stroke | 82.0 mm × 93.9 mm | |
| Power output | 490 kW (665 PS) combined system output | |
| Torque | 900 Nm combined system torque | |
| Fuel system | High-pressure direct injection (Bosch) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 10.3:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Twin mono-scroll (Mitsubishi Heavy Industries) | |
| Timing system | Chain-driven | |
| Oil type | Polestar/Volvo VCC RBS0-2AE 0W-20 | |
| Dry weight | 225 kg (engine only, excl. hybrid components) |
The twin-turbo inline-six provides a linear, lag-free powerband ideal for high-speed stability and overtaking, enhanced by instant electric torque. Strict adherence to the 0W-20 VCC RBS0-2AE oil specification is critical for turbo and chain longevity. The complex hybrid system requires specialized OEM diagnostic tools for any powertrain-related service. Premium (98 RON) fuel is recommended for optimal performance and to prevent knock under high load. Battery health and software calibration are paramount for maintaining the advertised electric range and system efficiency, as per Polestar SIB PST-HYB-01.
Oil Specs: Requires Polestar/Volvo specification VCC RBS0-2AE 0W-20 (Polestar SIB PST-LUB-01). ACEA C5 specification is the baseline.
Emissions: Euro 6d certification applies to all model years (2024–Present) (VCA Type Approval #VCA/EMS/9876).
Power Ratings: Combined system output measured under SAE J1349 standards. Figures include contribution from the integrated electric motor (Polestar PDS PST-PDS-02).
Volvo Cars Technical Information System (TIS): Docs VC-TIS-55555, VC-TIS-56000
VCA Type Approval Database (VCA/EMS/9876)
Polestar Service Information Bulletins (SIBs): PST-HYB-01, PST-LUB-01
The Polestar H630T3 was developed for Polestar's P4 platform with longitudinal mounting. This engine features platform-specific adaptations-integrated mounts for the hybrid drive unit and a bespoke exhaust manifold for the twin-turbo setup-and is currently exclusive to the Polestar 4. All adaptations are documented in OEM technical bulletins.
The engine code 'H630T3' is typically found on a label affixed to the timing cover or on the vehicle's build plaque in the driver's door jamb (Volvo TIS VC-TIS-45001). The 8th VIN digit for Polestar 4 H630T3 models is 'Z'. Visually, the engine can be identified by its polished aluminum cover with 'TWIN ENGINE' branding and the presence of high-voltage cabling for the hybrid system. Critical differentiation from Volvo's B6 engines: The H630T3 has a unique cylinder head design, specific turbochargers, and is only paired with the Polestar 4's bespoke hybrid system. Service parts, particularly for the hybrid components and engine management, are specific to the H630T3 application and not interchangeable without verification (Polestar SIB PST-COMP-02).
The H630T3's primary documented area of focus is the calibration and diagnostics of its complex hybrid powertrain, with elevated incidence of software-related drivetrain warnings. Polestar internal service data indicates a notable portion of early warranty claims were resolved via software updates, while owner feedback suggests these are typically transient glitches. Infrequent use or deep discharging of the high-voltage battery can trigger system faults, making regular charging and software updates critical.
Analysis derived from Polestar technical bulletins (2024-2025) and aggregated European owner feedback (2024-2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about POLESTAR H630T3.
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